This thread made for a pretty cool read. I'm still sporting my 2 ghz 13'' macbook from like 2006/2007 and aiming to upgrade, but i'll hold off for the updates.
As a normal consumer (in university), i'd say the idea of a 13'' mbp without a OPP is bizarre. Non of my friends get why you'd get an mba unless you were rich. Nobody thinks of getting an external, they'd wonder why not to just put it in the computer. The MBA is seen has a luxury item. I'm sure that mindset is changing though. And if that's the way apple goes, then I think it'll still confuse some people.
I use my drive a lot for watching DVDs and burning music to itunes. Especially if i'm on a plane, or when i'm away from my home and i brought movies to watch. I get why it wouldnt' be used for some people, but i'm not sure i'd get rid of them. I use mine a lot. All music, movies, programs are sold on discs unless you're downloading digital. For music people, that sucks cause the quality is worse, and i don't want movies taking up space. Why would i want something that needs an outside drive to use them. It's easier to pop on my bed and watch a show on DVD's than have to rig up an external. bleh. That makes it harder for people i'd say.
I really want to get a MBP 13'' in the updates, i hope it still has its OPP.